Discharge can be a noun or a verb; it has multiple meanings in physics, chemistry, military, and legal usage. The most common medical meaning is a substance that is being excreted. Examples: pus is the discharge from a pimple; a vaginal discharge can mean infection; an ear discharge can mean an infection of the outer ear tract; a nasal discharge may be a 'cold'.
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2

Baginal Discharge :
Read this webmd article: http://women.Webmd.Com/guide/vaginal-discharge-whats-abnormal. At age 18, most of the serious diagnoses are very unlikely. Of course, you could be pregnant from a prior encounter, but a cervical polyp or infection could be in play. I would contact your gynecologist and explain your symptoms - he will likely have you come in for an evaluation.
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4

I recommend...:
Taking a pregnancy test and if it comes up negative then i recommend seeing a doctor so that they can make a proper diagnosis and give you something to get rid of the condition or relieve symptoms.
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6

Depends:
Depends in what context you are asking. It can be abnormal, normal, or transitional. It all depends on your history. It may be important for you to see a provider to be sure. They may be able to run tests on the discharge and obtain a complete history.
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7

Inflammation:
Most likely, that is blood mixed into your discharge causing the pink/red color, indicative of some inflammation form somewhere. It may be infectious, so if it continues, see the Dr.
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9

Can be:
Plan b commonly causes irregular bleeding for up to 2 months after taking. Be sure to take a pregnancy test 14 days after the sex to be sure it worked. Risk of pregnancy if Plan B was taken within 72 hours of the sex is less than 1%.
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